Question about 1999 GMC Yukon

1 Answer

Have a 99'Yukon. Runs fine at cruising but if I give it gas while cruising, it lugs unless I really step on it.

Posted by on

1 Answer

Need to get caught up on Preventative Maintenance
AFTER you road test with professional scan tool & look
at data

My Guess:

Spark Plugs are not changed every 3 years
Oxygen Sensors are in the motor over 100,000 miles
Egr issues ?
Cylinder Misfires?
OBD Codes in the systems?
Worn Out TPS Sensor ?
Fuel Pressure ?
Worn Out Exhaust Converter-- for sure-- if original-thus loss
of fuel control

DO NOT THROW Parts at it

Have it tested & find a problem

Posted on Nov 23, 2014

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 51 Answers

SOURCE: accelerator does not respond sometimes

check your throttle position sensor. god bless.

Posted on Feb 16, 2010

SOURCE: My 99 Ford Taurus is starting to lug, misfire, cut

Check for codes. Sounds like a bad coil

Posted on Mar 10, 2010

mlapres
  • 757 Answers

SOURCE: supercharger troubleshooting????

Check for a vacuum leak from the inlet and outlet hoses on the boost bypass valve and especially the boost solenoid.

Posted on Mar 16, 2010

johnjohn2
  • 5763 Answers

SOURCE: 99 chevy tahoe, 5.7 starts and idle fine, slowly

I have seen this type of problem before, this sounds like the engine is not getting the correct amount of fuel pressure it needs as you accel.the first thing is to remove the fuel filter and replace it, take the old filter and blow into it, this will tell you if its restricked. the next step will be to check fuel pressure, you will need a gauge for this test, hook up gauge at valve on the injector rail, take caution wear safty glasses as fuel is under pressure and will spary out a little as you connect line for the gauge to fuel injector rail valve, you will run the engine and also step on gas pedal as you watch the pressure, i would rev the engine to around 3000rpms and hold it to see if engine tries to stall or buck when it begins to act up look at the gauge and if the pressure drops as it starts to act up then the fuelpump is bad. its not able to keep up the pressure. start there good day.

Posted on Oct 20, 2011

airjer995
  • 5332 Answers

SOURCE: 99 buick start easy then dies unless you give it gas. then stays running until you go to start again.

Check the fuel pressure regulator. It is on the drivers side, front of the engine near the throttle body. Remove the vacuum hose and see if fuel comes out of the nipple. If it does than the regulator needs to be replaced.

If the regulator is fine than you will need to check fuel pressure with a gauge. If fuel pressure drops as soon as you shut off the car than the fuel pump is likely bad.

Posted on Jul 26, 2012

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If i slowly increase speed, runs fine. give it


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